Bitgappsarm1200r45 Link Access
Ensure your device is ARM (32-bit) and not ARM64. You can use an app like "Droid Info" from the Play Store to verify this.
For older specific revisions like R45, the 4PDA BiTGApps Thread often maintains an archive of various builds including R45. Key Features of the R45 Build bitgappsarm1200r45 link
Without rebooting, select Install in recovery and choose the BiTGApps-arm-12.0.0-R45_signed.zip file. Reboot: Wipe cache/dalvik and reboot to the system. Ensure your device is ARM (32-bit) and not ARM64